The Fin occurrence is located on the south side of Finlay River, 21 kilometres north-northeast from the north end of Thutade Lake, about 201 kilometres northwest of the community of Germansen Landing

The Fin occurrence area is underlain by dacite crystal tuff of the Saunders Member of the Lower Jurassic Toodoggone Formation (Hazelton Group). The rocks are commonly quartz and feldspar-phyric and dacitic to andesitic in composition. The volcaniclastics are intruded by coeval quartz monzonite to monzonite porphyry intrusions of the Black Lake Plutonic Suite. Post-mineral trachyandesite to latite dikes trend north to north-northwest cutting all earlier stratigraphy and intrusions.

The main distinction between the geology of the Pine (094E 016) and Tree (094E 045) occurrences and Fin is that the latter two are underlain by a contact between hornblende granodiorite-monzodiorite of the Giegerich pluton of the Black Lake Plutonic Suite and dacitic tuff of the Toodoggone Formation, whereas the Toodoggone Formation at Pine is extensively intruded by stocks, dikes and sills of quartz monzonite, monzonite and quartz latite.

The Fin showing is characterized by older, unaltered to weakly altered granodiorite to quartz monzonite intrusions of the Giegerich pluton. A minor amount of resources were invested in mapping within this area, due to the target style change to a copper-molybdenum porphyry system. Local sampling showed anomalous copper occurrences, as well as minor elevated base metals. Fin occupies a large domain of low response in the aeromagnetic data.

Drilling on the Fin occurred as part of Cominco's 1990 drill program which included 23 vertical percussion holes for a total of 1460 metres on the Pine-Tree-Fin areas (Assessment Report 21139). No significant copper, gold, or molybdenum values were recovered from this drill program on the Fin area.

In 2005, the Cascadero Copper Corp. drilled eight holes on the Fin that were located 400 metres to the southeast of the historical Cominco percussion-drill holes testing historical copper and molybdenum soil geochemistry and a steep gradient in a historical induced polarization chargeability survey. Newly identified copper and molybdenum mineralization was located at surface in the previously un-drilled portion of the extensive induced polarization chargeability anomaly. Drilling identified mineralization as pyrite and chalcopyrite disseminations, as fracture fillings, veinlets and as aggregates. Molybdenite occurs as disseminations, as aggregates and in quartz vein selvages. Diorite exhibits moderate patchy propylitic alteration with epidote-pyrite veinlets with trace molybdenite-sphalerite veinlets along epidote salvages. A sheeted quartz vein set (6-8 veins per metre) occur with pyrite-chalcopyrite-sphalerite and trace molybdenite. Magnetic values have an inverse relation with copper and molybdenum.

Drillhole F05-02 (one of the best holes for molybdenum and copper values) averaged 0.1 per cent copper over 43 metres (17 to 60 metres downhole) of potassium-feldspar altered granodiorite with intervals of strong silicification and sericite alteration overprinting the primary textures (Assessment Report 28071). The drillhole had elevated molybdenum values between 28 and 30 metres downhole (0.033 per cent molybdenum) and between 35 and 38 metres downhole (0.022 per cent molybdenum) (Assessment Report 28071). Molybdenite was observed as disseminations along hairline fractures.

Drillhole F05-05 averaged 0.098 per cent copper over 140 metres with greater than 0.12 per cent copper in intervals 41 to 56 metres, 67 to 103 metres, 109 to 136 metres and 141 to 149 metres downhole (Assessment Report 28071). Mineralization over the 140 metres is hosted in granodiorite-quartz monzonite.

See Tree (094E 045), located 565 metres west, for further geological and work history details.